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Enable CSS aspect-ratio sizing

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Basilisk-Dev 2026-05-10 13:00:24 -04:00 • committed by wuggy
commit 7766f8f53d
12 changed files with 164 additions and 1310 deletions
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57
layout/style/nsCSSParser.cpp
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@ -944,6 +944,8 @@ protected:
// Property specific parsing routines
bool ParseImageLayers(const nsCSSPropertyID aTable[]);
bool ParseAspectRatio(nsCSSValue& aValue);
bool ParseAspectRatioRatio(nsCSSValue& aValue);
struct ImageLayersShorthandParseState {
nsCSSValue& mColor;
@ -12993,6 +12995,59 @@ CSSParserImpl::ParsePropertyByFunction(nsCSSPropertyID aPropID)
#define BG_CLR (BG_CENTER | BG_LEFT | BG_RIGHT)
#define BG_LR (BG_LEFT | BG_RIGHT)
bool
CSSParserImpl::ParseAspectRatioRatio(nsCSSValue& aValue)
{
nsCSSValue width;
if (!ParseNonNegativeNumber(width)) {
return false;
}
float w = width.GetFloatValue();
float h = 1.0f;
if (ExpectSymbol('/', true)) {
nsCSSValue height;
if (!ParseNonNegativeNumber(height)) {
return false;
}
h = height.GetFloatValue();
}
// Degenerate ratios behave as auto in layout.
aValue.SetFloatValue(w == 0.0f || h == 0.0f ? 0.0f : w / h,
eCSSUnit_Number);
return true;
}
bool
CSSParserImpl::ParseAspectRatio(nsCSSValue& aValue)
{
if (ParseSingleTokenVariant(aValue, VARIANT_INHERIT, nullptr)) {
return true;
}
nsCSSValue autoValue;
bool hasAuto = ParseSingleTokenVariant(autoValue, VARIANT_AUTO, nullptr);
nsCSSValue ratioValue;
bool hasRatio = ParseAspectRatioRatio(ratioValue);
if (!hasAuto && !hasRatio) {
return false;
}
if (hasRatio) {
if (!hasAuto) {
// The grammar is "auto || <ratio>", so auto may appear after the ratio.
ParseSingleTokenVariant(autoValue, VARIANT_AUTO, nullptr);
}
aValue = ratioValue;
return true;
}
aValue.SetAutoValue();
return true;
}
CSSParseResult
CSSParserImpl::ParseBoxProperty(nsCSSValue& aValue,
nsCSSPropertyID aPropID)
@ -13031,6 +13086,8 @@ CSSParserImpl::ParseSingleValuePropertyByFunction(nsCSSValue& aValue,
switch (aPropID) {
case eCSSProperty_clip_path:
return ParseClipPath(aValue);
case eCSSProperty_aspect_ratio:
return ParseAspectRatio(aValue);
case eCSSProperty_contain:
return ParseContain(aValue);
case eCSSProperty_font_family: